Sorry for the slow update, I had a last minute international situation for work to handle (sounds much more exciting that it really was)
Update on the exhaust, making the S/S version before my MOT didn't happen, my exhaust chap couldn't make it in time as he's had to take on a Motorsport contract.
Instead he removed the old cats and Y pipe, removed and replaced the flanges on both (seems mine had failed both sides) and re fitted the OEM parts, below is a picture of the work. I'm very impressed with it. He's welded on different style flanges, that negate the expensive crush gasket found on the OEM exhaust.
I'll admit, it's arguably an inferior design, but this cost me next to nothing (I won't quote on it unless it was a "mates rates" deal). and the car is now silent (I've had the exhaust blow since I bought it, so this lack of sound is very strange to me, though I can now hear a knock from the offside front damper (typical).
I'll try to keep the momentum up and get pictures of the new S/S exhaust ASAP.